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Comparison between electrochemical capacitors based on NaOH and KOH activated carbons

机译：基于NaOH和KOH活性炭的电化学电容器的比较。

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This work describes the chemical activation of a coke using two different activating agents to investigate their behavior as electrodes in supercapacitors. A coke was chemically activated with two hydroxides (KOH and NaOH) under nitrogen flow, at a constant mass hydroxide/coke ratio of 2 and temperatures of 600, 650, and 700 °C. All of the samples were characterized in terms of porosity by N2 sorption at 77 K, surface chemistry by temperature-programmed desorption (TPD), and electrical conductivity. Their electrochemical behavior as electric double-layer capacitors was determined using galvanostatic, voltammetric, and impedance spectroscopy techniques in an aqueous medium with 1 M H2SO4 as the electrolyte. Large differences in capacitive behavior with the increase in the current density were found between the two series of activated samples. The different trends were correlated with the results obtained from the TPD analysis of the CO-type oxygen groups. It was found that these oxygen groups make a positive contribution to capacitance, finding a good correlation between the specific capacitance values, and the amount of these oxygen groups was found for both series.
机译：这项工作描述了使用两种不同的活化剂对焦炭的化学活化作用，以研究其在超级电容器中作为电极的行为。在氮气流下，氢氧化物/焦炭的质量恒定比为2，温度为600、650和700℃时，用两种氢氧化物（KOH和NaOH）化学活化了焦炭。所有样品的孔隙率均通过77 K下的N2吸附，表面化学性质（通过程序升温脱附（TPD））和电导率来表征。使用恒电流，伏安法和阻抗谱技术在以1 M H2SO4为电解质的水介质中确定了它们作为双电层电容器的电化学行为。在两个系列的激活样本之间发现电容行为随电流密度的增加而有很大差异。不同趋势与从CO型氧基团的TPD分析获得的结果相关。发现这些氧基团对电容有正贡献，在比电容值之间发现良好的相关性，并且在两个系列中都发现了这些氧基团的量。

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